ML073170393

Survey Unit Release Record EP 1.91

ML073170393
Person / Time
Site:	Plum Brook
Issue date:	11/07/2007
From:	US National Aeronautics & Space Admin (NASA)
To:	NRC/RGN-III/DNMS/DB
References
EP 1.91
Download: ML073170393 (14)

Text

Survey Unit Release Record Design # Survey Unit #(s) Description Approval Signatures FSSICharacterization Engineer v - EP-1.91 1.91 1) Embedded Pipe (EP) Survey Unit 1.91 meets the definition of embedded pipe for Plum Brook Reactor Facility (PBRF). 2) EP 1.91 is a Class 1, Group 3.1 survey unit as per the PBRF Final Status Survey Plan (FSSP) and Technical Basis Document (TBD)-06-004.

3) Surveys in EP 1.91 were performed using a scintillation detector optimized to measure gamma energies representative of Cs-137. Sample #EP 3-12 fiom Survey Request (SR)-13 was referenced for this decision.

4) Survey Instructions for this survey unit are incorporated into and performed in accordance with (IAW) the Babcock Services Incorporated (BSI)/LVS-002, Work Execution Package (WEP)05-006. Survey instructions described in this document constitute "Special Methods" and the survey design used in the acquisition of survey measurements.

5) Instrument efficiency determinations are developed in accordance with the BSWS-002, WEP 05-006, these determinations are appropriate for the types of radiation involved and the media being surveyed.

Revision # Original Page 1 of 3 FSS Design # EP 1.91 Revision # Original Page 2 of 3 I Survey Unit: 1.91 I 1.1 The subject pipe system is a 6" floor drain line located on the -27' el. valve pit of the Rx building.

1.2 EP 1.91 consists of 6" diameter piping that is approximately 30 feet in length. 2.0 Survey Design Information 2.1 EP 1.91 was surveyed IAW Procedure

1. BSIkVS-002.

2.2 1 W? of the 6" ID pipe was accessible for suvey. The accessible 6" ID pipe was surveyed by static measurement at one foot increments, for a total of 30 survey measurements.

2.3 Surface area for the 6" ID piping is 1,459 ad for each foot of piping, corresponding to a total 6" ID piping surface area of 43,780 crn2(4.4 mZ) for the entire length of (approximately 30') of 6" piping. 3.0 Survey Unit Measurement Locationfiata 3.1 Pipe interior radiological survey forms are provided in Attachment 2 of this release record. 4.0 Survey Unit InvestigationdResults 4.1 None 5.0 Data Assessment Results 5.1 Data assessment results are provided in the EPiBuried Pipe (J3P) Survey Report provided in Attachment

1. 5.2 All measurement results are less than the Derived Concentration Guideline Level (DCGL) for radionuclide specific EP that corresponds to the 1 mrendyr dose goal established in Table 3-3 of the FSSP.

5.3 When implementing the Unity Rule, provided in Section 3.6.3 of the FSSP, and applying the Nuclide Fraction (NF), provided in TBD-06-004, the survey unit that is constituted by EP 1.91 passes FSS. 5.4 Background was not subtracted from the survey measurements and the Elevated Measurement Comparison WC) was not employed for this survey unit.

I FSS Design

1. EP 1.91 I Revision # Original I page30f3 I I Survey Unit: 1.91 I 5.5 Statistical Summary Table Statistical Parameter 6.0 Documentation of evaluations pertaining to compliance with the unrestricted use limit of 25 mrem/yr and dose contributions

&om Embedded Pipe and radionuclides contributing 10% in aggregate of the total dose fbr both structural scenarios and soils. 6.1 A review of the survey results has shown that the dose contribution for EF' 1.91 to be less than 1 mrem/yr. The dose contribution is estimated to be 0.006 mremtyr based on the average of the actual gross counts measured.

7.0 Attachments Attachment 1 - BSI EP/BP Survey Report Attachment 2 - Pipe Interior Radiological Survey Form Attachment 3 - DQA Worksheet Attachment 4 -Disc containing RR for EF' 1.91 & Spreadsheet SECTION 7 ATTACHMENT 1 3 PAGE(S)

BSI EPlBP SURVEY REPORT DotectorSled

1. Blemn 1 MGlAVSln07 Detector E(IWcncy Survey UNt Classlfimtton TBD (36-004 P~pmg Group SR-13 Radlonucltde DMnbulion Sampk Measured Nudlde Area FactortEMC Used PasslFall FSS MREMMR Contnbutlon 3 1 EP 3-12 Cs-1W No Pass el COMMENTS' ACTMTYVALUES NOT BACKGROUND CORRECTED - RP Eng~near I Date 07 EP 1.91 6" Pipe TBD 06-004 Group 3.1 EP 1.91 6" Pipe TBD 06-004 Group 3.1 SECTION 7 ATTACHMENT 2 3 PAGE(S)

BSI/LVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form Date: I I,/! 3 /O 6 Time: /$I7 1.11 Pipe ID#: Pipe Diameter:

Access Point Area: Vk up p, Building:

!&I LAO Elevation:

System: ~LR J~RO Type of Survey Investigation Characterization Final Survey , Other J Gross C06O Cs I/ Detector ID# I Sled ID# / u?l6 I C V S - / /A Detector Cal Date: 17/%0/. d$ Detector Cal Due Date:

I Z/Z O/O 6 Instrument:

233- I Instrument ID #: Zo34StiL Instrument Cal Date: 71 T/O 6 Instrument Cal Due Date: - a7 I From the Daily Pipe Survey Detector Control Form for the Selected Detector Background Value 9, 7. cpm mCRs~tic I?,Z cpm Efficiency Factor for Pipe Diameter 0, ooo 3 3 (from detector efficiency determination) mcstatic 3\0b dpm/ 160 cm2 Is the MDCStati, acceptable?

No (if no, adjust sample count time and recalculate MDCR+,tic) comments:

s~~w POST ~ELO~ Svfl~Gy & P3-12 COMPLE~E prnnmJE2+ - GL~SOW A Technician Signature

/ Pipe Interior Radiological Survey Package Page 1 of 3 Attachment 3, Page 1 BSIiLVSPipeCrawler-002 Revision 4 Pipe Interior Radiological Survey Form (Continuation Form) Date: 11//3/0 6 Pipe ID#: 'q f Pipe Diameter:

6" Access Point Area: vh L.E. P/ j- Building:

%I- %I(M Elevation:

-27 System: F~P- W. Package Page 2 of 3 Attachment 3, Page 2

SECTION 7 ATTACHMENT 3 f PAGE(S)

Page 1 of 1 SECTION 7 ATTACHMENT 4 1 DISC